[fakedang]

Fun fact, the Rothschild and Rockefeller wealth still exists, although it's heavily fragmented. For the Rockefellers, the US government explicitly stepped in and split their golden goose (Standard Oil - > Exxon + Chevron + Texaco). The Rothschild money permeates Europe throughout. The split is because that's what happens when you get a family spanning more than thousands of members. And each of their branches are massively wealthy.

You mention the UAE dipping into its SWF, except it already does that. The SWF accumulates the oil wealth from exports, which is reinvested into various investments around the world. A fraction (about 50B USD) of the annual returns from that wealth is what is used to run the UAE and all of its welfare programmes, its military, etc. Unlike the Saudis, UAE and Qatar both benefit from really small local populations - there are about 300k Qatari citizens and 1M Emirati citizens worldwide.

And Buffett is not lucky. He made a lot of successful bets everywhere year - I recommend reading his investor letters if you can, where he explains his rationale behind every investment decision, including the ones that turned out to be duds.

Just as you say that SWFs won't exist in 50 years, there are banks in Switzerland that have existed for hundreds of years. Oxford and Cambridge are just as prestigious today as they were 800 years ago. Once a culture is established and buttressed, it will be hard to shake it off.